Casting method for valve body of anti-explosion valve

A technology for explosion-proof valves and valve bodies, which is applied in the direction of casting molding equipment, casting molds, and casting mold components. It can solve the problems that the accuracy of bolt holes cannot be effectively guaranteed, there are many casting processes, and the rate of scrap is high, so as to achieve good spheroidization effect, Improving the performance of castings and the effect of improving the performance of castings

Inactive Publication Date: 2016-07-20
QINGDAO NPA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are still some problems in casting production. The explosion-proof valve body casting has at least one explosion-proof valve body with a bolt hole structure for connecting other components, such as explosion-proof valve body pipe fittings, valves, etc. The current explosion-proof valve body casting process Among them, there are no bolt holes on the finished explosion-proof valve body castings, and the bolt holes need to be processed. Not only are there many casting processes, which affects the production capacity, but the accuracy of the bolt holes cannot be effectively guaranteed, and the scrap rate is high.

Method used

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Effect test

Embodiment

[0009] (1) Ingredients: The parts by weight of each component are: 80 parts of Q10 pig iron, 20 parts of scrap steel, 15 parts of ferrosilicon, 2 parts of scrap copper, 1 part of nodulizer, and 1 part of inoculant; the prepared Q10 pig iron and Steel scrap is put into the electric furnace and heated to 1300-1370°C; then the weighed ferrosilicon is added, and the temperature of molten iron continues to rise to 1570-1600°C. (2) Add the spheroidizing agent to the bottom of the ladle, cover the upper part with the inoculant, and pressurize the iron to cover and compact it; add scrap copper to the other side of the dam of the ladle for molten iron. (3) Pouring the valve body, the temperature of the cast valve body is lowered to 350°C, then heated to 670-760°C, kept for 3-5 hours, cooled to 300°C in the furnace, kept for 4 hours, then heated to 650-760°C, Keep warm for 17 hours, cool to 400°C at 50°C / hour, and then cool to 140°C at 20°C / hour. (4) Pour pouring fluid into the sand mo...

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PUM

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Abstract

The invention discloses a casting method for a valve body of an anti-explosion valve. All components include, by weight, 80 parts of Q10 pig iron, 20 parts of scrap steel, 15 parts of silicon iron, 2 parts of waste copper, 1 part of a spheroidizing agent and 1 part of a nucleating agent. The prepared Q10 pig iron and the prepared scrap steel are added into an electric furnace to be heated to 1300 DEG C to 1370 DEG C; the weighed silicon iron is then added to the electric furnace, and molten iron is continuously heated to 1570 DEG C to 1600 DEG C; and pouring liquid is poured into a sand mold of the valve body through a sprue, cooling and solidifying are conducted, the cooled and solidified object is taken out and subjected to steam treatment, and then the valve body of the anti-explosion valve is obtained. The casting method is simple in formula and technology, and industrialization is easy to achieve; and the common waste steel and the common waste copper are used for improving the performance of castings, and the cost of raw materials can be reduced in a multiplied manner.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a casting method for an explosion-proof valve body. Background technique [0002] There are still some problems in casting production. The explosion-proof valve body casting has at least one explosion-proof valve body with a bolt hole structure for connecting other components, such as explosion-proof valve body pipe fittings, valves, etc. The current explosion-proof valve body casting process Among them, there are no bolt holes on the finished explosion-proof valve body castings, and the bolt holes need to be processed. Not only are there more casting processes, which affects the production capacity, but the accuracy of the bolt holes cannot be effectively guaranteed, and the scrap rate is high. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22D1/00
Inventor 常维宁
Owner QINGDAO NPA IND
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